SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f9a95fb812368b5ab90d1b48f21fcff0d36652ca382b4388e36b5168ed15fc2' 
  AND token = 'x7QXCgpxR8bb4GGnZvmI2PuOewvAHtCC81sSzu9Kh8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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