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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbe00a40987cbad00b1f28256e112d71c6bd6a1c37d20a99a5a42712045f4ea4' 
  AND token = 'bgWwodFnde1qlPZH9pTftgtY0sDtrJX9NJeOK95RziM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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