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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35972fc8a391508a84e57f2e8c21b4c2d352ab4b043073011e570fd927fa4254' 
  AND token = 'xI7UkxWDRqoJo0ClriRUwrsx0FKWl5HqwxhIn4AWZ1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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