SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bea5e4f62e54f0e3b32131f800e564f071997aa5a03ed49889287f78e0cdc28b' 
  AND token = 'GTP9T2V2EsQ7qmADQ1vSBuOJrAB8haK7VZEyDYhS/ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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