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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '877dca10a2150da06f81643118954c112a7e5baa555aca9bf01b8f6dbf531fb6' 
  AND token = 'Gln8kVpSNlaqVRqTPJ0vXq271/gYSmSQ3iKSWd1t4uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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