SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f111d1469fb149a473b6f4179c2382c21690500ff45db319e3f8e8ff8bf5226c' 
  AND token = 'CNqjjRLaD/A/NCWR7AGvY9kfcPs6O7L3dZMvbI2ufJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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