SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d2f6d53090065a7e735da3efd9d352c90d4a2cdf1bbbfb347643fa9678adf53' 
  AND token = 'Ul42n3B8vqYVxswEifHMFtqJWlAYBq9Cn25tOF8UnXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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