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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47e77ee9044e4fcce87b87af43bd4834f799f7f62bb3991ebc9b3b2d9019cc88' 
  AND token = 'IIm+HsrALCKzvz8TY93GK7teKfdM/guGHON8zMwswA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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