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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c1ded46fa92f7e1856c3fac453fa737a08e5c664af099215a8cbe60a8ed6839' 
  AND token = '5zMkRYahqc9EtJdUdxrD9Grh6wVweFj4r7IxuTy+9a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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