SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73c393b41c8fb8c40c2a42947b4b20183a08e0823ae688078e8878e59ab16153' 
  AND token = 'jhBmiZXDYHWNwbJbKg9uffq4YVEsb2sn4uER4aBWRG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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