SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1b5c48c851180d263f2b59e020bcc673e3b6287c298512055f441371a8d1798' 
  AND token = '0Q4NLpGgYcN7SmfAkwoehoSML4mv9BoHPqidVX2CDr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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