SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f71f545b05e993e4d84119e2f0240ea5142064291d9f6a7c74354eae679a1c13' 
  AND token = 'ipZ6wWzbrJK1LGyt+DBZu/8RTY0tGknxd8+tSQFPbao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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