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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75069adc3e511c3fa61c8e539ca58c4a8c73b3e8b415cc6c98c6cbf8f315d234' 
  AND token = 'QHBuhi6qxiUcm33YiXVA9GSa6Of8/GK9oZXVhkW6/Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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