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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd17c0135a7fd1de48d1219c392d75d4062cc333a46e47be8ebd1a6d4619229d3' 
  AND token = 'NUvOv+aZmMf8mo7uErr6UKlWXSrKuZqnIf0RQtwhAcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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