SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b67afbed949869ed2ab4b146a1e90d1171920419e7078d508a6fa76779a0c68' 
  AND token = 'qOZ5/Gdnu9PAwQuLNnmdw6njQqC2+J/Zvh32evC/g4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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