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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd39d3210d8e48a2d5d80f73c9858f4be62251a34d28bbed6231f7a40d5c4d7b9' 
  AND token = 'JwSdMlt54cVgZ3kxQvfIqvy3HKe2QUb6fPs0YNJvg5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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