SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee23659ff3042e4fcb5e60e867e05c9ff9dcf6a169a31039f6a35145fb92c7d0' 
  AND token = 'N/utucqhUgWTEwwqnxsWqjTGyK5HbxkfNmDYlri+Cx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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