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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '865f58f691d0d76eb823181c664a86d629b2c32c31924e12eee2e75f490f645f' 
  AND token = 'mjS7KXuq9eF7iNZrL/amiFWQqvcPQfpn6ihQI24ciNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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