SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '354d0853265a376bab75c8c99812545a18d62a077b0d14042f7a38299f6cf29b' 
  AND token = '294Q75KFg2g3ozwvBNUxC6P2qY+wir2cDqym3YG+iTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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