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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a80f36a13d418d47a769076e28b142d43f9f27896e86112d3cd2f1fd8e8e2bfb' 
  AND token = '5H5VnOJ799EELnuTVwadm7WoLxkmgcXBbnFXS0hz7J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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