SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32b6be6eb9876ce8dab1155a990ab3638803a7ecb33ff1b571fabf5b9f2d2d74' 
  AND token = 'RJISzlfLjCnnXUEmdQS/CPI45OgRqZ2RMLLTCLwDl4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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