SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e33724b3bde4936aa968361c5a780be3fe7ed92f552836603b51051fa724d3bb' 
  AND token = 'IFJTsPd/U0LK8WcBPd/ePu9m0VjOqngYjv5yMYsjgVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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