SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e90119a153171f871a1d3ac959bfe0712d196ba8a968ff8e70b9326720970662' 
  AND token = 'zs0yucRhyRwZZFTGAMXQk+zlB4WtOIGqT/92RK8tqJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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