Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '420d82301bb8de90b53edd985d94004a7eac118f2d399bc0ce5ca655b0af6e4e' 
  AND token = 'PaMTfXN8ycwMu9A+ErbK6yM4r16AFqk7n8uS+RhwNzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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