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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ed8634aa49211e0f4b182c6e94cf9261310f8485762ac21fa3cdeb7591d8c94' 
  AND token = 'q6A9WC2Ynqn+nPXBk1YkEOZI5VUAbxrdeJ9JQn13uOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}