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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '666c050dccf00e2a45172a936d1ebcc809850b82274967d279bca6ca0cc26070' 
  AND token = 'WCj1q6zXdlOEySB4+kDu403BSxc8S06Cn0Lg8c6yAX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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