SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5da642f58663cbd8459ab7826e07f521c421ead99e67bfbd2a8d4ab43dbdfd24' 
  AND token = 'RH1JBdBGUBXEFtVK526KYCbZ0OMcDv7l55zcYmIF++k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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