Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55d8f8b19d1a29f1e16083b1878e214a3a0252dbb6e1e6bff7f9af8a13e0ee07' 
  AND token = 'mkRBjMne5a2oI2MyirXVhlbGNNrb7n0ZB5A2jfa1Fh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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