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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c117a674719fd3076415ded3cc767ecf260798d1f8d244ad34906a8daeea4925' 
  AND token = 'k65l58ncnnSXolVUkL0+Y4Sdc5nIwdAQFusjnFjw2ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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