Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0ce1cf93e70f5d36599f9c3ea9e441119b0608a29b7fa4bd0ea6936fbe70715' 
  AND token = 'HK7pqQIkmi7DviwxLZpQzpcCOfRcGsyw1EewNNR3QJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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