SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab182e5b36f616559b354da5def09875028d6241a0200cefa9b92173c790ce1a' 
  AND token = 'jcC9B5JktHqv5fY0h5VhBj56KZmpJTfr7YRfejcgpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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