SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2b1be9ec5df0e4a4dc40a7d1bbcd2ed20c607387534412c4d3235d8a61a8398' 
  AND token = 'T+btJtJZJUfPF/5JVzbhp5ijfaZi//ckUqE9gVJaj6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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