SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '429d6e19db1ac9386c8630fb6c62f6b2edf7faa6cb512b8ffaa56da517ab0295' 
  AND token = 'WIigQ5hMV2h/QufFXF+ilZjKCAiQWBYS12+2q4znDkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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