SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be2ca13c2d874d01431df6db5c738c7fd02b473d6fa6394fc6b48ee917da8154' 
  AND token = 'KeCJGeb8SxXQhulQeAQ+bkxYVR+/vS1w7LyU2qAT6pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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