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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba0942d9dff4bcafcbe5cd18e3b42e25b09bad3265b998f7e414836aa4fbffa9' 
  AND token = 'laSqUgglwKIhSRt6u92G6AjbIVlbbsaUuJsVWa+alz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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