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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25b6d098009bde3a7836a56d07b9a582b8350cefd44df9bea8c369d556101ca1' 
  AND token = '5rrEnKtRFRljx+AFki8szQcMAKH8CvqOoRw737E61sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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