SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44e43c53f4a8d990ea4b3137125765e5818ba880b0f40bcb956974b03cd46965' 
  AND token = '+DlfJrgzGSW/ZQiglhjLeoZwmU03XzdU8PrUK5WMUh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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