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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fa6d2dae85c2ea749a52d58b3f6df9eaf780d99c0a5f12f4baafcada5d7b39e' 
  AND token = 'HkGSKrgOu5qxdOvh5vIObHx5swr2H8jjAKGGSlqJYFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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