SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b12b0491604f9c25feee667cd99fa62d51d74e868b0553185232570bc559a6e' 
  AND token = 'zu9BXTaVxWdb4H3Av7Vcmif9Qs/I4Pg2Acv3F1vmp+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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