Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec3e6fa8b772dbf2ec96a877ead58f5c1d4df49faacfd6dccd3c7d891b50a70a' 
  AND token = 'PZeS2Sp08uBnVOdhXvPRySQmccJlAWKQjEVU9qSCDEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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