SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89256ee5e50938e3bc300a68d137c4177951bf6359dafb13302a60432edd6176' 
  AND token = 'uB4y/JraPFLm6mOSunG8ltX4N+yEU9C/HVeUUBAGwjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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