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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f17507562c8aa578c9d67aafcea45795b6be62a6567622760edf135dc0a387b9' 
  AND token = 'qHMN3xpQUl0ih1fH/ZtRn7wIWEjiadwgOhddEfKWkyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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