SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b403d2fb97c21a967e88edc53c51d60426bbbd21d9f6f5fa5cb6595b2059617b' 
  AND token = 'Vh3IBRYhansEthcljdAAyErW8+FMUDK/ofjQgRyX/Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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