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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a149f33ca5dabd89198b757ec584fca6a5c1eeab690da1b6f2676cbb0770c27f' 
  AND token = 'wNh6dBY4lT9ItSPdUiu+IY8D7eIc326BWWscEXm53x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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