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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '946a4bdc9551cc667aaa747124b39d71abc1fa1410a97b1898cbaee167ebc27a' 
  AND token = 'KaLL/NpL+rgI+o8DB1Tqbdpl/0ZYkYEJxM/SZplDdVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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