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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b6d357921326fda2f8fb58373c26ae610aee1e329a2243f609cfb27bef4a08b' 
  AND token = '8CiTBTo1C+PbKpfXNvzrtWl9Zc7Ea6TysJ4MxKOz7ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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