SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d0b57e28e154754bd98382fa4e761a73145314e5b3bf510f5d19f92999c97e8' 
  AND token = '05tObqpec5BZEqeeYi+CaReSChIBhJ7uO2GgsdAwHvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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