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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec9d9660489b6038235b9ee41f18b8ba3f3ea56852ee8252cac65eeb697a2551' 
  AND token = 'N1YazhSGybAhHrX+nW/9ZojUhZ1eGSpgFLFdLEiFIfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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