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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d29cb6062bb536e39de2bebb370441775b6d61d07507c511251cd40920e987e' 
  AND token = '8BAmf0PqpTtJgC3H3NYigpgFBELSj9kv6G9FQtk60jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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