SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '981745bd2e05f03dc75f3ef538be3797f84635d90efb7fc7c3e162f244d8d62a' 
  AND token = 'hteVKwR4/9Nw2PEG77ho9K1byEZq01JIh9QDbVqSlGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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