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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a71184030f43845863dd134cb40171b2d1d452a85bcc27fb5064fd4476a343f' 
  AND token = '4TycX10y0rVa7LON47YZW+S2iAWDPzeKXD6g8/Lihuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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