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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80bc5d771f3ff61b4ede45ce56b73c302655779386783b63b3705221231b8d6b' 
  AND token = 'H6pV2DDVdpi7z0POu8euSPtC/F3nEvh2SdCcbVGu/1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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