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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff1e3d2d369eb366dbb24750d981199f59c8e8fd91d92fd0205b66876a9d7b02' 
  AND token = 'Q7VBqU9LyepcG7Tu9LgpLVxg3/kVS5e5ypjKcvFfADg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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