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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04f7dea658c04f61ce64a58e936e348cd9afceee9276815c41f0d9f518e32c70' 
  AND token = 'ASy0q2qXIJ5cvr36duWIjUxIyinTOaKxq3nAMv/gA38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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