SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ee9fa3e812f46ea572a3c330d31ca865784b5f8d5cc37eb62d39768b6bc26f' 
  AND token = 'u3BGxi9iFzYow80xU8puKPvS3klb4/Wu50tZ/HCA6TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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