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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ad12d5842a79aced09907d87d08818c7ee8a6962debcbedef7a25d8bbdb56c3' 
  AND token = 'FWsb3nMR6uYT9w2QEex1uAzNQTH26D/i3zrw/r6YIn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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