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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '688e01a714cc0cdc9337d497ef48482e6db7ad5ef2acf3a02ec0ee6d9754dea0' 
  AND token = 'U7Kp49hwyL4heLQibrqP2gLgijBs2q6Dvr/fevEdqHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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