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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51c3867da163963deaab56eb69519bd9252182e838c2afce998ae9de1ba2ba47' 
  AND token = '105zk/BKidqjgH43jZVGpD3LP2qE8R3HeoSaQTL/YOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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